A pyramidal metal organic frameworks-derived FeP@CoP aluminium-ion battery cathode displaying low-temperature tolerance and fast electron transfer kinetics.

Abstract

Engineering appropriate cathode materials is significant for the development of high-performance aluminum-ion (Al-ion) batteries. Here, a pyramidal metal organic frameworks (MOFs)-derived FeP@CoP composite is developed as cathode, which exhibits good stability and high capacity. FeP@CoP cathode remains a high capacity of 168 mAh g-1 after 200 cycles, and displays a stable rate-performance at both room and low temperatures of -10 °C. After three rounds of rate-performance cycling, the FeP@CoP composite recovers 178.2 mAh g-1 at 0.3 A g-1. Moreover, density functional theory (DFT) calculations verify improved electron-transfer kinetics with narrowed band gap and enhanced density of states. Those findings would inspire a broad set of studies on MOFs-derived composites for high-performance secondary batteries.